#region (c) 2014 THN Solutions LLC. - All rights reserved
/*
Simplified BSD License (BSD)
THN HTTP Stack Library
Copyright (c) 2014, THN Solutions LLC. ( www.ThnSolutions.com )
Author: Nguyễn, M. Hải                 ( www.Minh-Hai.com     )
All rights reserved.

Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:

    * Redistributions of source code must retain the above copyright notice, this 
      list of conditions and the following disclaimer.

    * Redistributions in binary form must reproduce the above copyright notice, 
      this list of conditions and the following disclaimer in the documentation 
      and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 
BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA,
OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 
POSSIBILITY OF SUCH DAMAGE.
*/
#endregion

#region Record of Change
//             							CHANGE HISTORY
// -------------------------------------------------------------------------------------
// |   DATE    | DEVELOPER  | DESCRIPTION                                              |
// -------------------------------------------------------------------------------------
// | 12-Nov-12 | HaiNM      | First creation.                                          |
// -------------------------------------------------------------------------------------
//
#endregion

#region Record of Audit
//             							REVIEW HISTORY
// -------------------------------------------------------------------------------------
// |   DATE    | REVIEWER   | NOTES                                                    |
// -------------------------------------------------------------------------------------
// -------------------------------------------------------------------------------------
//
#endregion

#region Using directives
using System;

using Thn;
using Thn.IO;
#endregion

namespace Thn.Net.Http
{
    /// <summary>
    /// Internal byte stream used by various HTTP components. This class support allocating buffer from a pool.
    /// </summary>
#if DEBUG || TESTING
    public
#else
    internal
#endif
 class HttpByteStream : ByteStream
    {
        #region Fields
        IBinaryBuffer mBuffer;
        #endregion

        #region Properties

        #region Pool
        private IBinaryBufferPool mPool = BinaryBufferPool.Default;
        /// <summary>
        /// Gets or sets reference to the pool used for allocating buffer.
        /// </summary>
        public IBinaryBufferPool Pool
        {
            get { return mPool; }
            set { mPool = value; }
        }
        #endregion

        #endregion

        #region On Allocate Buffer
        /// <summary>
        /// Obtain a new buffer that can support the required capacity.
        /// </summary>
        /// <param name="requiredCapacity">Total number of bytes required.</param>
        /// <param name="buffer">The allocated buffer.</param>
        /// <param name="startingOffset">The starting offset in the buffer.</param>
        /// <param name="allocatedSize">Actual size allocated. Must not be smaller than required capacity.</param>
        protected override void OnAllocateBuffer(int requiredCapacity, out byte[] buffer, out int startingOffset, out int allocatedSize)
        {
            mBuffer = mPool.Allocate(requiredCapacity);
            buffer = mBuffer.Buffer;
            startingOffset = mBuffer.StartOffset;
            allocatedSize = mBuffer.AllocatedSpace;
        }
        #endregion        

        #region Constructors
        /// <summary>
        /// Default constructor.
        /// </summary>
        public HttpByteStream()
        { }
        #endregion
    }
}
